/Engine/Source/Runtime/Engine/Public/Animation/AnimInstanceProxy.h
Get whether the most relevant animation was in a particular notify state last tick.
bool WasAnimNotifyStateActiveInSourceState ( int32 MachineIndex, int32 StateIndex, [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UAnimNotifyState](API\Runtime\Engine\Animation\AnimNotifies\UAnimNotifyState) > AnimNotifyStateType ) const